The water retention property of HPMC is also related to the temperature used, and will decrease with increasing temperature. But in the actual material application, in many circumstances, the dry mortar is often used in construction under the conditions of high temperature (above 40 degrees). In the case of plastering for exterior wall putty under sun exposure conditions in summer, this often accelerates the curing of cement and hardening of dry mortar.
The decline in the rate of water retention will obviously cause that both the workability and cracking resistance are affected. In this condition, reducing the effects of temperature factor becomes critical.
Although the HPMC additive is now considered at the forefront of technological development, its dependence on temperature will still result in the weakening of performance of dry mortar. Despite the increase in the amount of HPMC (formulations in summer), the workability and resistance to cracking still can not meet the needs. Through some special treatment for HPMC, such as increasing degree of etherification, etc., its water retention effects can maintain better results in high temperature conditions, so that it can provide better performance in harsh conditions.
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